脊椎植入物组件静态和疲劳性能试验方法研究

THE STATIC AND FATIGUE TESTING ON THE MECHANICAL PROPERTIES OF SPINAL ARTHRODESIS IMPLANT ASSEMBLIES

依据标准ASTM F 1717-01,对通用脊椎植入物组件进行了静态测试(压缩弯曲、拉伸弯曲和扭转)及疲劳测试。结果表明,通用脊椎植入物组件静态压缩弯曲屈服载荷850N,2％时屈服位移1．52mm,屈服弹性位移13．63mm,压弯刚度62．30N／mm,屈服时总位移15．15mm;静态拉伸弯曲屈服载荷1240N,2％时屈服位移1．52mm,屈服弹性位移19．56mm,拉弯刚度63．25 N／mm,屈服时总位移21．06 mm;屈服扭矩30N·m,2％时屈服角位移1．95°,位移屈服弹性角位移4．61°,扭转刚度6．43 N·m／(°)。屈服时总角位移6．57°,疲劳极限载荷参考值380N。

The test is according to the Standard Guide of American Society of Testing Materials ASTM： F 1717-01, 《Standard Test Methods for Spinal Implant Constructs in a Vertebrectomy Model》. Uniaxial static tests （including three types： compressive bending, tensile bending and torsion） and fatigue tests are carried out for the general spinal implant assemblies. Results show： the static compressive bending yield load of the general spinal implant assemblies is 850N. 2% offset yield displacement is 1.52mm Yield elastic displacement is 13.63mm The compressive bending stiffness is 62. 30N/mm, and the total yield displacement is 15. 15mm; the static tensile bending yield load of the general spinal implant is 1 240N. 2% offset yield displacement is 1.52 mm Yield elastic displacement is 19. 56mm. The tensile bending stiffness is 63. 25 N/mm, and the total yield displacement is 21.06 mm; The yield torque moment of the general spinal implant is 30N · m. 2% offset yield angular displacement is 1.95 degree. Yield elastic angular displacement is 4. 61°. The tortional stiffness is 6. 43N · m/（°）, and the total yield angular displacement is 6. 57°; the reference value of ultimate fatigue load of the general spinal implant is 380N.